Dresden 2009 – scientific programme
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MA: Fachverband Magnetismus
MA 33: Bio- Molecular Magnetism
MA 33.7: Talk
Thursday, March 26, 2009, 11:45–12:00, HSZ 103
SMM-like magnetic properties of Cobalt(II) Cubane [Co4(HL)4(Cl)4] — •Klaus Gieb1, Konstantin Petukhov1, Andreas Scheurer2, Ayuk M. Ako2, Rolf W. Saalfrank2, and Paul Müller1 — 1Department für Physik, Universität Erlangen-Nürnberg, Germany — 2Department für Chemie und Pharmazie, Universität Erlangen-Nürnberg, Germany
We report on magnetic properties of the novel tetranuclear cobalt compound [Co4(HL)4(Cl)4]. We have found that this Co(II) cubane system shows evident single-molecule magnet (SMM)-like behavior. In particular, we have found that the nominal ground spin state of this complex is S = 6. The uniaxial anisotropy parameter D has a negative value of around -1.6 Kelvin. Relaxation studies have evidenced a single relaxation process following an Arrhenius law. The anisotropy barrier is Δ≈55.8 K and the relaxation time is τ0≈10−8s. The measurements were performed by means of SQUID magnetometry, AC susceptibility measurements, and micro-Hall-probe hysteretic characterization.